Michael Harmon    On nighttime excursions in dark-sky hot spots like Norway, New Zealand and Nevada, all you have to do is relax and look up. The stars will do the...

Emma Bubola, Edward Wong and Sarah Pabst    The U.S. has pressed Argentina and Chile to review two Chinese telescope projects in the Andean deserts. Astronomers are worried about setbacks to...

Michael Levenson    The Pentagon on Friday released online what it called new, never-before-seen files, dating back decades, related to unidentified flying objects.

Helene Cooper    The initial files are murky images that show what could be anything. The government said more would be released on a rolling basis.

Kenneth Chang    A gradual dimming and brightening when a star passed behind it suggested the mini-Pluto was wrapped in a thin layer of air.

Kenneth Chang    The space agency is counting on Jeff Bezos’ company to deliver equipment essential to the next moon landing, only two years away.

Erin Griffith and Ryan Mac    Even before the rocket company holds a major initial public offering, many people own stock in it through so-called special purpose vehicles.

Emily Baumgaertner Nunn    Researchers identified a species that can survive radiation, extreme heat and simulated Martian soil, posing a new challenge for protocols intended...

Katrina Miller and Emily Elconin    In the Big Bend region, a portal to the early universe is enabled by the largest dark-sky reserve on Earth.

Ryan Mac    As SpaceX prepares to go public, Mr. Musk has proposed moonshots that differ from the company’s original aim of reaching Mars.

Robin George Andrews    The frequency of fireballs in our planet’s skies seemed to grow in recent months. NASA and other meteor experts can’t agree on what explains it.

Dennis Overbye    An underwater observatory recently detected a startlingly energetic cosmic neutrino. One possible cause involves a phenomenon that so far exists only...

Robin George Andrews    In a stroke of luck, astronomers saw the comet C 2025 K1 (ATLAS) break into four or five fragments in November after it passed close to the sun.

Robert D. McFadden    He gave readers a comprehensive and lyrical account of the historic mission in 1969. His science coverage as a Pulitzer-winning journalist and an...

Ryan Mac and Lauren Hirsch    Mr. Musk’s rocket and satellite maker disclosed its financial performance as it prepares to go public in what is set to be one of the largest...

Jorge Mitssunaga    The Pentagon released new, never-before-seen U.F.O. files on Friday. The files include murky videos and still images that do not show anything...

Adeel Hassan    The Earth slips behind the moon in an iPhone video taken by Reid Wiseman during NASA’s Artemis II mission, a sequel to the iconic Earthrise photo...

Kenneth Chang and Adeel Hassan    The four astronauts spoke at a news conference Thursday afternoon at Johnson Space Center in Houston about their journey around the moon and back to...

Cynthia Silva    New video shows the moment the Orion capsule opened after landing last week. Inside were the Artemis II astronauts who had completed a 10-day mission...

Jorge Mitssunaga    After splashing down in the Pacific Ocean, the Artemis II crew members reunited with their friends, families and fellow NASA astronauts in Houston on...

Kenneth Chang    The four astronauts made an emotional return to Houston a day after splashing down in the Pacific Ocean at the end of their 10-day lunar journey.

Ruth Graham    A mission that took four astronauts farther than any human has ever traveled in the history of mankind has made people feel a little trippy.

Jackeline Luna    The four astronauts aboard Artemis II splashed down at 8:07 p.m. Eastern time in the Pacific Ocean near San Diego on Friday, concluding their...

Katherine Cusumano    Fifty-six years ago, after a tense race to save the Apollo 13 crew, the astronauts finally splashed down safely. Here’s what flight directors who got...